Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28c1518bdaa3ed7…

MALICIOUS

PDF

88.7 KB Created: 2021-09-20 15:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ba242a61c41f040b93c45e1c412381a9 SHA-1: d16dd02e4ffd4757a3b03d3b8b046622c2f0cf2f SHA-256: d28c1518bdaa3ed7fb6177015beaac19c54d59a51e7138a7ec11c7442c4c9602
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document exhibits multiple indicators of malicious intent, including a high ML classification score and ClamAV detection as a phishing trojan. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware. The presence of a 'Clipboard command execution lure' and a 'Visual download button' strongly indicates a social engineering tactic to trick the user into executing a malicious payload, likely by copying and pasting commands into a shell.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/uplcv?utm_term=install+windows+7+on+android+phone PDF link annotation
    • http://karlsbach.de/userfiles/files/11918224020.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/88117040968.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/zikuwokojesej.pdfIn PDF document text
    • https://soechi.net/userfiles/file/94028498425.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/basuligidoviw.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/15708094879.pdfIn PDF document text
    • https://onlinendttraining.net/files/bidikopujevowedix.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jozafigu.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/mifafenujunimaravuko.pdfIn PDF document text
    • http://davcpundri.com/css/file/48540703899.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/butav.pdfIn PDF document text
    • http://bushurov.ru/images/files/94344333051.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/fotizedumakobotivesobavop.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/nujiwoguzadibiwuvosesije.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021092016483670554.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/78192639831.pdfIn PDF document text
    • http://levotst.com/uploads/files/11113276116.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/30005819170bfd3c34e4257eb21d2333/71636489455.pdfIn PDF document text
    • https://cian.hr/userfiles/file/sebiwutan.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/43slb9melh0o0oca64jq9j6pik/75383894642.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50810664779.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136c00408342---82909753194.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/livununutasepadod.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 10576 bytes
SHA-256: 64b0e185a55dff98be212445bc6e26344417ffb3ac15e9575d728b58d5406bb6
font_01_sfnt_off00010c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C20 18692 bytes
SHA-256: d2d9d91317df527d4cf36bf54ab4bae58511219878b6328ffd913c76a6f95db4
font_02_sfnt_off00013cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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